NASCAR Heat 5

Do this in the XDT Series. It will cost you about 600k for everything to buy and upgrade.
each Teammate can be hired for $20 and maxed at about $22k.
The cars cost max. $60k for all 6, starting at 1k, 5k, 8k and so on.
The departments can be maxed for I think $100k?

I've started with $11.2M and ended up at $10.6M after buying and maxing everything in the XDT Series.

I might also add, that I did this in Season 4 after gaining a little bit of money.

This was easiest done for me in the Xtreme Dirt Series in my second season.

During my second season I was competing in the truck series with my own truck, accumulating wins and money. After racking up enough cash, the additional cars and staff were way cheaper to buy in the dirt series.

Once you have enough money go to the “Teammates” tab where you can view your staff. To the right will be additional slots to add more staff. The additional staff members require you to have all 6 cars purchased in your car slots, then you’ll be able to purchase up to 12 staff.

The staff members are cheap to purchase after the cars are purchased. The last 4 staff members cost me $20 each.